Предмет: Алгебра, автор: NIKITACHERNOV15

1-cos²a+tg²a•cos²a=
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Автор ответа: slganiev
1

Відповідь:

2 sin²α

Пояснення:

1-cos²α=sin²α         tg²α=sin²α/cos²α      а дальше всё просто:  sin²α+sin²α/cos²α*cos²α=sin²α+sin²α=2sin²α

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Определите, являются ли утверждения:
а) истинными b) ложными c) в тексте нет информации
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